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Re: very high idle using up to much gas can smell gas
As far as the gas smell....a pin hole in the fuel line is what I'd be looking for...a small amount of gas can smell like a gallon because of the Naptha that's added to gasoline. If the car isn't runing you won't be able to see any gas line leaks because ther is no demand for the fuel to be pumped, or any pressure in your fuel line.
I'd suspect you have a gasket leak for the reasoning beind the racing engine RPM
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disconecting batt resets the computer. now it needs to learn how to set everything to run again. disconnect batt for atleast 60 seconds, re atach, start car it will start and die(dont press gas) do this over and over until it idles (could take up to 10 times). by pressing the gas you make the computer think it is idling to high so it keeps turning down the idle. it will idle fine after reseting computer and starting several times without hitting gas peddle.
This should be a drive by wire vehicle meaning it has a cable for the throttle body. First thing would be to see if any error codes can be pulled up (most parts stores will do that for free.) Drive by wire versus the late model that use electronic control for the idle have a IAC or idle air control which when first started controls the idle air intake--all air is run by it to idle the vehicle when cold--
Usual symptoms are rather high idle when cold engine or even idle and RPM jumping up and down and stalling when cold.
Another way if idle does drop when cold is tapping the gas--engine will still run until hot. Means not usually a fuel pump issue.
You could also have if the vehicle is fuel injected a dirty Mass air flow sensor, a throttle position sensor, etc.
These can be if the vehicle has them cleaned using a special zero residue spray cleaner.
First have it scanned to see what if any errors it shows--the computer.
Sounds like the fuel pump is going bad(or in this case,has gone bad). I suggest that you change the fuel pump and use a fuel cleaner in your gas tank as dirty gas may have caused the problem to begin with.
the rotten egg smell is a catalytic convertor going bad. here are a few symtoms.--- you should notice a drop in power and also a higher running temperature,also at night you may notice a slight glow from this thing if its heating up,it will also loose power ,on any kind of a hill or small incline it may idle rough from time to time also,there are several warning signs of one going bad ,if your in doubt about it,you can have it checked,they can drill a hole in it and check the back pressure on it,this will tell you if its going bad,this is actually the best way to check it out. have a good day !!
could be trash in fuel filter or around pickup screen in tank. While driving everything sticks to them like magnet when you shut off and it sits it all falls off to happen again when you start the vehicle again
Change all the filters (fuel and air). check and see if all your spark plugs are firing or just change them. if it is fuel injected make sure your injectors are working. Hope something there helps get it running good.